Search is your friend. What tire size are you planning to run? I am assuming 33s atleast for a while? The 30 can handle that but if you are planning on going much bigger I would go to a 44. You can get rid of the vac set up fairly easy. Just find a D30 that doesn't have the vac set up and get the longside shaft. Put a seal in the passenger side (not sure of the PN) and make a blockoff plate for the vac housing. Just pick a 44 front end, they will all take work to get under the front of a YJ. Some more than others but ultimately non are bolt in and go.